Perhaps you should try some spelling variations:
thuong cong » thong cong, thuong con, thuong dong
nhieu tang » chieu sang, nhiet nang
hieu lang » chieu sang, hieu quang, hieu van
tuong va » truong va, thuong va, luong va
cong tan » cong tac, cong san, cong thanh
tan than » tan thanh, tan tran, ban than
than cau » toan cau, phan cau, than cap
tung va » trung va, dung va, vung va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((hieu lang) or (nhieu tang)) - thanh ((tung va) OR (tuong va)) thuong cong tan than cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((hieu lang) OR (nhieu tang)) - thanh ((tung va) OR (tuong va)) thuong cong tan than cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((hieu lang) or (nhieu tang)) - thanh ((tung va) OR (tuong va)) thuong cong tan than cau".
• Adding a wildcard symbol may retrieve word variants: hoc ((hieu lang) or (nhieu tang)) - thanh ((tung va) OR (tuong va)) thuong cong tan than cau*.